The U.S. Army Corps of Engineers will limit the services available to visitors at Roosevelt Park near Roosevelt beginning this month.  The changes include providing portable toilets rather than flush toilet facilities.  Three portable toilets will be provided, and the number may be adjusted if situations require it.   Additionally, free shower facilities will be closed and the potable water system turned off.   Visitors will need to bring in their own drinking water.   The vault toilet facility at the boat ramp will continue to be maintained for visitor use.  John Day Dam operations project manager Glenn Smith cited budget constraints as the reason for the changes.